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Sale of Oil and Natural Gas Property Interests - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
a
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
a
Sep. 30, 2015
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Sale of conventional oil and gas properties and related equipment $ 400,000   $ 4,700,000  
Gain or loss on sale of conventional oil and gas properties and related equipment     1,000,000  
Proceeds from sale of unproved lease properties     3,900,000  
Gain or Loss on sale of oil and natural gas properties     0  
Proceeds from sale of unproved lease properties     4,800,000  
Gain or Loss on sale of oil and natural gas properties     0  
Gain on sale of assets (102,000) $ (290,000) $ 944,000 $ 5,183,000
Acreage Trades [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain or loss on sale of conventional oil and gas properties and related equipment 0      
Proceeds from sale of acreage trades $ 1,100,000      
Area of acreage trades | a 149.5   149.5  
Maximum [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on sale of assets $ (100,000)